Expanding mandrel.



J. ENOCH.

EXPANDING MANDREL. APPLICATION FILED APR. 4, 1912.

Patented Jan. 18, 1916. v

inventor: Jenn Enoah I flbb s.

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To allaohpm it 91mg) concern: p,

a c. EN Q a mu zen of the United States of America, and a resident ofthe city of Springfield, in: the

county ofClarlsand the State of Ohio, have invented certain new anduseful Improvements in Expanding Mandrels, of wh ch the following is afull, clea gc and exact descrip tion, reference being had to theaccompanying drawings, liorminga pant of this specie fication.

My invention relates to mandrel suitable for use in lathesand othermachine shop appliances,and it has iorone of its objects to provide amandrel of this kind comprising an arbor and a sectional sleeveexpansible by the arbor, with the parts so fitted to each other as tonecessitate the sleeve sections remaining constantly parallel to eachother, with the result of causing all of the sections to befadjustedradially with accuracy to the wallet the bore in which the mandrel isfitted.

Another object of my invention is to provide means whereby the sectionsof the sleeve are prevented from turning on the mandrel. p

A further object of my invention is to provide the sleeve sections ofanexpansible mandrel with adequate means :tor preventing longitudinaldisplacement of either of the sleeve sections relative to the othersections. i

Figure I is a perspective view or my expansible mandrel. Fig. II is across section oi the mandrel expanded Within a fragment of anobject towhich it is fitted. Fig llll a view showing the arbor of the mandrel inelevation, and the expansible sleeve in section. expanded within anobject to which the arbor is fitted. Fig. IV is a cross section of amodified form of mandrel. I p p In the drawings: 1 designates a taperingarbor provided with a plurality of grooves 52 that extend longitudinallyof thearbor and are preferably equidistant from each other.

8 designates segments of an expansible sleeve, the segments being ofsuch width and form that when they are combined together in the sleeveand their side edges are in contact, the sleeve will fit closelytothearbor 1 while it is upon the smaller portion of said arbor, Without thesleeve being exthese grooves receive the spring binding Specification ofteat-rs Patent.

an expanding I LPtItQntBC lJttlig. 1916.

Applicationfiled A rils, 1e12,, s rial l p/essa st.

felt u h e iaiaes bl sl ve said s ment are s p rat d m re or l s am s sheth r s ing to th deg ee Qt r mea t th ute ines l e to Q larger diameterportionstheneinto. 1 ner faces of the sleeve segments alle beveled wimmr to th ta e at t at a and the outer faces of the segmentsare so formedthat the slee e is a the seme ter telnet die n- ..eter throughoutitslength, to fit a straight bore through any object in which themandrel is placed and secured by the expansion of itssleeve. Each sleevesegment 3 is provided near its endswith pins a that extend pended to any,When i the p beyond the inner face of the segment and are adapted toride in one of the longitudinal grooves 2 in the arbor 1. These pinsserve to hold the segments absolutely in alinement with the axis of thearbor, when the arboris forced into the sleeve and, therefore, preventthe segments from movement into positions diagonally relative to suchaxis to the detriment of their seating accurately against the wall of ahole or bore in which the mandrelis fitted, as they should in obtaininga propel-frictional connection of the mandrel to such object.Furthermore, the pins act toprevent rotation of the arbor within theexpansible sleeve, or turning of the sleeve on said arbor.

5 designates tongues extending from the side edges of the expansiblesleeve segments,

and (3 are notches in such segments with which the tongues match to holdthe segments to prevent independent longitudinal movement of any segmentrelative to the other segments. The tongues 5 are integral with thesegments that carry them, and of the'same thickness as the segments andeach of said tongues is non-circular in shape. g

The notchesfi extend the full thickness of the segments containing them,and corre spond in shape to the shape of the tongues which enterthereinto. By thus making said tongues and grooves I provide very strongslip joints between the segments, the tongues of such joints beingcapable of withstanding all of thestrain there is any possibility oftheir being subjected to in the act of forcing the arbor into theexpansible sleeve of my mandrel.

The expansible sleeve segments are provided with transverse grooves 7,which match together in a complete circle, and

rings 8, Which serve to hold the sleeve segin which the expansiblesleeve segments 3*;

are provided With holes extending therethrough and the spring retainingrings 8*" are provided With terminal inturned ends extending through theholes in 'the'segments and into longitudinal grooves 2 the arbor l Theinturned ends of the retaining rings serve toperform the same office asis performed by the pins 4 in the first described construction.

'I cla1m:-'

1 In an expanding mandrel, a tapered aring provided with a pair ofgrooves in its outer face for the reception of said spring bindingrings, and one of said spring binding rings being provided With aninturned end portion Which extends entirely through one of said segmentsand projects from the v inner face of the latter.

JOHN ENOCH.

In the presence of "ROBERT J. SAUM,

PERRY A. ZIMMERMAN.

' Washington, C.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

